Robert Curthose

Robert III of Normandy (1056-3 February 1134), also known as Robert Curthose, was the Duke of Normandy from 1087 to 1106. The second son of King William the Conqueror of England and Matilda of Flanders, Robert made an unsuccessful claim to the kingdom of England and was defeated by his nephew Henry I of England in 1106 in the Battle of Tinchebray.

Biography
Robert was the second son of William the Conqueror of England and Normany and Matilda of Flanders. He was the younger sibling of Prince Rufus, and the older sibling of Cecilia of Normandy. In 1082, Robert was sent by his father to campaign against rebel strongholds in France, capturing Rennes and conquering the Duchy of Brittany. In 1100 he captured Bordeaux in Aquitaine, giving England control of both northern and western France.

Upon his father's death in 1087, Robert became Duke Robert III of Normandy. His older brother Rufus became King William II of England, dividing the former personal union that King William I had founded in 1066. He took part in the unsuccessful rebellion of 1088 against King Rufus, and was contented with his domain. However, when his nephew became Henry I of England after assassinating Rufus in 1100, Robert made a claim to England as the brother of the late Rufus. In 1106, Robert was defeated in the Battle of Tinchebray in Normandy, crushing his revolt. He was stripped of his titles, and died in 1134.